Preparation of wool containing fabrics for dyeing purposes



Patented Mar. 29, 1932,

nunom'nnaucxmnmza; or anminm'w, G-ERMANY, ASSIGNOR TO DEUTSCHE woman-WARENLMANUFAKTUR:AKTLENGESELLSGHAFT, or GRU Ene, QHGERMAINY nannies; orwool," eomarnma FABRICS iEOR :DYEI'NG rim-rosns a, mating. Applicationoiil ed A 'r'n 10, 1928, semi 26am, and in Germany amen '93, 152k.

' I This invention"r alaftes to a method for preparing wool containingfabricsfor dyeing P P eS-o i Q a vThe d eing of wool containing fabricsin the pieceisaproblem whichhas not been solvedyet in a satisfactorymanner. The fabrics namely contain fatty and mineral spinning. oils andlubricating oils from the looms. They furthencontaimfthi's isespecially-the case withhalf-wool'en fabrics a certain content of sizeand often cellulose derivatives, when old material and rags containingartificial silk are used in the manufacture of the fabric, which containfurthermore dirt and other foreign substances. -Until now the woolcontaining fabrics were subjected to a washing treatment with alkalinereacting washing liquids, in order to make them suitable for dyeingpurposes. This washing treatment lasted several hours; it was, however,not satisfactory and the dyeing of the washed fabrics could not becarried out without difiiculty, as the foreign substances interferingwith the dyeing process were not removed by the washing. Furthermore thetreatment of the fabric with alkaline reacting washing liquidschemically affected the wool fibres, thus diminishing the quality of thefabrics.

The above mentioned disadvantages are avoided, when working according tothe invention, which consists in treating the wool containing fabricswith certain organic solvents for cellulose ethers and cellulose estersand washing the treated fabrics with common water. Not all the organicsolvents for cellulose ethers and esters are suitable for the purpose ofthe invention, as only those solvents come in question, which areremovable from the fabric by a treatment with water at temperaturesbelow C. Solvents which cannot be completely removed from the fabric bya treatment with water at temperatures below 60 C. are not suitable, asthey would afi'ord for removing them completely from the fabrictemperatures changing the properties of the wool fibres of the fabric,thereby diminishing the quality of the fabric. The organic solvents forcellulose ethers and esters used for treating the fabrics do not onlyremove, the 'c'ell'tu lose "derivatives from the wool [containingfabrics, butals'oijem'ove allth'e other may and oily matter-fromthefabric. the. washing ,withwat'er following the treatment of the fabricwith solvent, for removing all the solvent absorbed by and adheringohthe fabric, size and dirt are also removed from the fabric. I

When workingaccordingto the invention the'wool 'cohtai'ning fabrics areprepared for dyeing purposes two successive, and very sii'nple steps,namely the, treatment with deiftain oi, 'anic solvents and the'washingwith water, "thereby removing all the a'nd parts-of th'efabri'c, whichare hoigid'us, h dy n Ifh fa ri may 'Eb i i?n th Pie w' i tl f bl afabricis hemieau ana physically o H aged, as no noxious chemicalsubstantiated n 0 tenip'eraturesabove 60 oare em' loy The treatment thefabric bout rl' imim s, wheres. the-t ea m wi h alkaline reactijngwashing'liquif d u'sed;"lliltfil now theart,' las'ts at l easttwoiiour's, With-V t y e agsa sf wryes 1i v. ol tsa 'ap edfor hr p ieftheih n a th fl qe d es rs f a iph ti at y acids such as methyljacetataethylacetate t'he like-, liquid ,k'etone's such fas acetone, y hyl 1 ketn are th i i and 0W- boi lingchloriniited hydrocarbons such asisopropylchloride, methylenechlori de and the like. Qbviouslyalso,miktures ofv these solvents be used,

The removal ofthe sOlveht's adhering on the'fabri'cafter the treatmentwithsolvehits takes placefaccording to different-principles. The estersa'nd keton'es used are water soluie and are thereforegsdis solved:during the wash ing process following the treatmentwith solvents.Thejchlorinated hydrocarbonsare not. water, soluble. They arethereforetohe lie 'e iri Su h nn ra het t y egbei ing a at temperatures ib elow j60 "in contradistinc tion myths 1 wate soluble solvents, whichmaybiiilathi 'her inp'eratur'e's, washing of the fabrics treated with;Ts'oivent's not soluble in water" has tobe cairidfo'iit with warm waterof a temperature slightly Examples 1. A piece of cloth, made from cardedyarn greased with oleine and consisting of wool and artificial wool iscontinuously drawn through one or several baths containing methylacetate, which is if necessary slightly heated; The methyl acetatetreatment is followed by a washing with cool water in one or severalbaths, through which the fabric is drawn after it has been squeezed,when coming out of the last methyl acetate bath. The time necessary forthe whole treatment of the piece of cloth is about 10 minutes, afterwhich the fabric is ready for dyeing urposes.

The methyl acetate enriched wit oleine is subjected to a distillation,thereby recovering methyl acetate as condensate and oleine as residue.The wash water is used so often, until it is enriched in methyl acetate.It is then also worked up by distilling off the methyl acetate.

2. A piece of half-woolen cloth made from Wool, artificial wool andcotton and greased with mineral oil is treated in the same man- I ner asin Example 1. The solvent used is a mixture of methyl acetate andmethylenechloride. The washing is carried out very thors oughly inclosed containers with water heated at 48 C. The solvents distilled offduring the washing are condensed, whereas the solvent dissolved in thewater is recovered after enrichment of the water by distillation.Duration of the treatment about 8 minutes.

3. A piece of cloth made from wool, artificial wool and waste materialcontaining artificial silk is treated with a mixture ofisopropylchloride and methylenechloride. By washing in a closedcontainer with warm water of about 45 C. the mixture of the solventsadhering on the fabric is distilled off and recovered by condensation.The solution of cellulose acetate and spinning oil in the solvents isworked up to pure solvents, cellulose acetate and spinning oil. Durationof the treatment about 12 minutes.

4. A pieceof cloth made from wool and artificial silk remanufacturedfrom rags is treated with methyl acetate or acetone, thereby removingthe oily matter and the cellulose derivatives from the fabric. Thesolvent adhering on the fabric is removed by a treatment with water.Duration of the treatment about 10 minutes.

I claim:

1. A method for preparing wool-containing fabrics for dyeing purposes,the said fabrics consisting at least in part of threads made fromartificial silk; comprising the steps of treating the fabrics with asingle liquid organic solvent, which possesses the property of removingany cellulose acetate which may be present in the artificial silk, andalso the property of removin other fatty and oily impurities from theabric, the said organic solvent being itself removable from the fabricby water at temperatures below 60 0.; and then washing the treatedfabrics with water at a temperature'below 60 0., in order to remove anyof the organic solvent still remaining in the fabric.

2. A process for preparing wool-containing fabrics for dyeing purposes,as described in claim 1, in which the liquid organic solvent is chosenfrom the group consisting of methyl ethyl ketone, isopropyl chloride,and methylenechloride. i

In testimony whereof I afiix my signature.

RUDOLF BRAUCKMEYER.

